docs: add changelog for 0.4.0

Author: NoNameProvided

CHANGELOG.md

@@ -0,0 +1,24 @@
+# Changelog
+
+## [0.4.0][v0.4.0]
+
+### Fixed
+
+- made the package compatible with TypeDI 0.9.0+
+
+### Added
+
+- added support for using scoped TypeDI containers instead of global one
+- basic test case has been added and configured to run for every commit
+- introduced Prettier to the project
+
+### Changed
+
+- updated project tooling to TS only build
+- updated various dev dependencies
+
+## < 0.2.3 - 2019.01.14
+
+_No changelog before release 0.2.3._
+
+[v0.4.0]: https://github.com/typeorm/typeorm-typedi-extensions/compare/v0.2.3...0.4.0